Protect on screen nothing plays
Unless there is something wrong with the head unit, there must be a
shorted connection. Try doing the same with no speakers plugged in and
see if the protection breaker trips. If it does not, then one of your
speaker cables is shorted. Try installing the cables one by one, and
test it, to see which one is at fault. Another remote possibility, is
that one of the speakers is blown, or has a load lower than what the amp
will accept.
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